Lockheed just rebranded the F-16V Block 70 for India as the F-21. Not to be confused with the U.S. Navyís small IAI Kfir fleet also designated F-21. The Ď21í is becoming popular, ie B-21. I also worry the USAF will next designate T-X as T-21, instead of sequentially correct T-54.

A customer at the hobby shop was confused by an after market aluminum barrel for a Sherman tank:"So this is for an Abrams tank, right?""No, it's for a Sherman, says so on the box.""But it says "75mm M-1". So it's for an Abrams.""No, that's the model designation of that particular 75mm gun, it's the first model.""So the Abrams used a 75 mm gun?""No. It's for a WW 2 Sherman. Says right *there*" Points to box."They didn't use Abrams in WW2."*Sigh*"Let's start again. What are you building?""An Abrams tank.""Ok, then this isn't the right gun for it.""But it says...""NO. M-1 means model number...""I don't know what the number of my model kit is...""NO. The REAL thing model number. M-1 can be a rifle, or a canteen, or a vehicle.""Like an Abrams, so this is the gun for it then?"*Al Crosses "M-1" off the box with a sharpie*"Not now. Use the gun in the kit, it's more accurate anyhow."